TRFM Series RF Amplifier Module
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1 Doc , Rev. C TIARRA Optical Node TRFM Series RF Amplifier Module Contents Equipment Description Model Names Functional Description Return RF Signal Flow Controls and Connectors Plug-In Circuits CBR-NA-90 Crowbar Surge Arrestor Specifications TRFM Series RF Amplifier Module Amp Figures Figure 24. TRFM Amplifier, Installed in Node Figure 25. TRFM Amplifier, Model Names Figure 26. TRFM, Functional Block Diagram Figure 27. TRFM Amplifier, Controls & Connectors Figure 28. TRFM Amplifier, Plug-In Circuits Figure 29. CBR-NA-90 Crowbar Surge Arrestor TRFM Series RF Amplifier Module 37
2 TIARRA Optical Node Doc , Rev. C 38 TRFM Series RF Amplifier Module
3 Doc , Rev. C TIARRA Optical Node Equipment Description Amp Figure 24. TRFM Amplifier, Installed in Node The TRFM series RF amplifier module fits into the base of a TIARRA optical station. It accepts RF input from optical components in the node s optical lid, amplifies the signal, and separates it into four high-level RF outputs. Designed for 870 MHz systems, the TRFM amplifies RF signal in TIARRA optical nodes, separating it into four high-level outputs. The TRFM amplifier is ideal for either trunk or distribution applications because you can set output levels independently. The four active outputs allow you to reduce your active count and equipment costs while segmenting your network into smaller service areas, extending system reach. The TRFM amplifier uses four Power Doubling silicon-type post-amplifiers to amplify output signals while minimizing distortions. A heavy-duty gas discharge tube protects the RF components and power supply from sustained high-voltage surges. An optional solid-state CBR-NA crowbar-protection circuit is available. (See CBR-NA-90 Crowbar Surge Arrestor on page 48.) TRFM Series RF Amplifier Module 39
4 TIARRA Optical Node Doc , Rev. C Plug-in diplex filters allow you to expand or change your return bandwidth as channel line-up changes and revenues grow. (See Plug-in Diplex Filters on page 44.) In addition, these amplifiers accept a number of plug-in circuits that allow you to customize each unit. Certain plug-in locations are accessible through cut-outs in the amplifier cover, making the module easier to set up and maintain. (See Plug-In Circuits, starting on page 48.) The amplifier is powered by a separate TPS-* series switched-mode power supply, located in the housing s optical lid. (See TPS Power Supply, starting on page 51.) 40 TRFM Series RF Amplifier Module
5 Doc , Rev. C TIARRA Optical Node Model Names 6 TRFM 4 _ 8 _ / 27 - _ / _ _ _ Silicon Output Hybrid TIARRA RF Amplifier Module Number of Active Outputs Amp Port 1 Function C = Common with AC In L = Launch with Return RF Out / AC In T = Transport with Return RF In / AC In 870 MHz Return Interface Board 1 = 4X1 = Basic 2 = 4X1 = Redundant: A (gain redundant) 3 = 2X2 = Segmented: B (gain segmented) 7 = 5X2 = Transport version 8 = 4X0 = Launch version 9 = 5X1 = Transport version Station Gain = 27 db Return Band Upper Frequency Limit (FL1) 40, 42, 48, 55, or 65 MHz Forward Band Lower Frequency Limit (FH1) 51, 54, 70, or 85 MHz Surge Suppression CB = Crowbar GT = Gas tube EMS Plug-In Option Blank = No EMS plug-ins EMS = PRS, RFD, and CS installed Figure 25. TRFM Amplifier, Model Names The TRFM series TIARRA RF amplifier modules come in a variety of models to accommodate various applications. TRFM Series RF Amplifier Module 41
6 TIARRA Optical Node Doc , Rev. C TRFM amplifiers are available in a variety of di-split models with diplex filters at each port to isolate one forward bandwidth and one return bandwidth. Examples follow: Model (Example) Hybrids Filters Gain Bandsplit Surge Suppression 6-TRFM-DI-27-48/54-GT Silicon Diplex 27 db 5 42 MHz, return Gas tube MHz, forward 6-TRFM-DI-27-55/70-CB Silicon Diplex 27 db 5 55 MHz, return Crowbar MHz, forward 6-TRFM-DI-27-65/85-GT Silicon Diplex 27 db 5 65 MHz, return Gas tube MHz, forward EMS capable? No No No 42 TRFM Series RF Amplifier Module
7 Doc , Rev. C TIARRA Optical Node Functional Description This section describes the signal flow through a TIARRA amplifier module. For more information on plug-in circuits, see page 48. Amp Figure 26. TRFM, Functional Block Diagram The TRFM provides four active RF outputs. Forward RF Signal Flow Tilt Generator: A plug-in 7-TG862-WC series tilt generator provides linear slope to the flat RF signal entering the amplifier from the optical lid. Pre-Amplifier: A push-pull input hybrid provides gain to the incoming RF signal. Forward Splitters: A set of splitters divides forward signals into four legs. These splitters have equal loss in each leg. (The splitters are located on two factory-installed 6B-SC series combiner/splitter boards. One board serves ports 3 and 5, and one serves ports 4 and 6.) TRFM Series RF Amplifier Module 43
8 TIARRA Optical Node Doc , Rev. C Forward Attenuators (factory-set, four locations): A factory-installed 9-A series attenuator in each forward path provides the specified gain at each output port. Forward Output Attenuators (customer-set, four locations): Each 9-A-WC series plug-in attenuator, accessible through the amplifier cover, allows control of output level from a specific RF port. A separate attenuator for each port allows you to set each RF output independently to accommodate system design. TRFM amplifiers are shipped with 0-dB forward output attenuators. You can reduce gain by installing a different attenuator value. Normally, rather than replace the forward output attenuators, you ll adjust the gain control on the TSOR optical receiver to change the levels of all outputs uniformly. Post-Amplifiers (four locations): The Power Doubling silicon-type post-amplifiers amplify output signals while minimizing distortions. Plug-in Diplex Filters: Diplex filters isolate the forward and return bands, and determine forward and return band edges. The high-pass filter passes forward signals and blocks return signals, while the low-pass filter passes return signals and blocks forward signals. The TRFM amplifier provides an optional path in the MHz band. This band is accessed through a separate plug-in diplex filter at each port. When this path is not used, a jumper is installed at each of the four locations. As technology defines the use of this MHz path, diplex filters will be inserted in these locations, creating a triplex application. Forward Test Points (four locations): Four -20 db test points let you check the level of the forward RF signal at the output ports without interrupting the amplifier s operation. Forward test points also permit test-signal injection into the return band. RF Ports (3 6): Forward RF signals exit the amplifier through one of these four G-style RF ports. These ports also route return signals to the amplifier. 44 TRFM Series RF Amplifier Module
9 Doc , Rev. C TIARRA Optical Node Return RF Signal Flow RF Ports (3 6): These ports route return signals to the amplifier. Plug-in Diplex Filters: Diplex filters isolate the forward and return bands, and determine forward and return band edges. The high-pass filter passes forward signals and blocks return signals, while the low-pass filter passes return signals and blocks forward signals. Return Test Points: These -20 db directional coupler test points let you verify the return RF signal level coming out of the diplex filter without interrupting the amplifier s operation. Return Input Attenuators (four locations): The 9-A-WC return input attenuator allows you to reduce the signal level of individual return legs to isolate problems during troubleshooting. These attenuators are replaced with 9-A-TERM 75-ohm plug-in terminators in legs not being used for return signal. (See page 222.) EMS Transponder: The optional Xp CORE provides various EMS status monitoring and control functions. Port Return Switch (four locations): Each TRFM return leg accepts a 6-PRS-PCB port return switch, which is EMS-controlled to isolate return-path noise ingress by adding attenuation in specific steps. RF Detector (three locations): Three TRFM return legs (at ports 3, 5, and 6) accept a 6-RFD-85 RF detector that tells the EMS transponder whether or not broadband RF energy is present at that port. The fourth leg (at port 4) does not accept an RF detector. Current Sensor: This sensor provides the EMS transponder with an indication of current consumption on the +24V supply rail for the entire station. Return Combiners: These combine the return signals and send them on to the 6TIAN-RIC return interface combiner board. (These combiners are located on two factory-installed 6B-SC series combiner/splitter boards. One board serves ports 3 and 5, and one serves ports 4 and 6.) Return Interface Combiner: The 6TIAN-RIC series plug-in circuit combines the return paths into one or more outputs. Amp TRFM Series RF Amplifier Module 45
10 TIARRA Optical Node Doc , Rev. C Controls and Connectors 3. Fuses (ports 1, 3, 5) 5. Return Interface Combiner (6TIAN-RIC) Connector Openings 6. Mini-SMB Connector for TSOR Cable 4. Surge-Protection Device 11. Tilt Generators 3. Fuses (ports 4 & 6) 2. Return Test Points, -20 db (ports 3&5) 2. Return Test Points, -20 db (ports 4&6) 1. Forward Test Points, -20 db (ports 3 & 5) 7. Power Connector VDC Test Point 1. Forward Test Points, -20 db (ports 4 & 6) 8. RF Jack (J5, port 5) 8. RF Jack (J6, port 6) 8. RF Jack (J3, port 3) 8. RF Jack (J4, port 4) 8. RF Jack (J1, port 1) TRFM base 9. Unused Jack (J2, port 2) Figure 27. TRFM Amplifier, Controls & Connectors This illustration shows the TRFM amplifier module s controls and points of connection. Callouts are defined in the following table. For locations of plug-in circuits, see page TRFM Series RF Amplifier Module
11 Doc , Rev. C TIARRA Optical Node Designation 1. Forward Test Points, -20 db (ports 3 6) 2. Return Test Points, -20 db (ports 3 6) Description Directional coupler test points. Used to measure the forward RF signal at each output without interrupting the amplifier s operation. The forward test points allow access to the return band as well. You can t measure return signal here, but you can inject return test signals. Directional coupler test points. Allow verification of the incoming return signal without interrupting the amplifier s operation. 3. Fuses (for ports 1, 3, 4, 5, 6) 25-amp fuses. Direct AC power to the designated ports. 4. Surge-Protection Device Gas-discharge tube or crowbar protection circuit. 5. Return Interface Combiner (6TIAN-RIC) Connector Openings 6. Mini-SMB Connector for TSOR Cable These openings allow access to the connector(s) on the plug-in 6TIAN-RIC series board, which accept the cable(s) attached to the TSOT return transmitter(s) in the optical lid. Accepts the cable attached to the TSOR receiver in the optical lid. 7. Power Connector Accepts the power cable to the OIPD (optical interface power distribution) board. 8. RF Jacks (J1 J6) G-type female connectors. Route forward outputs to distribution cables and return inputs to the amplifier. AC can be received through any of these four jacks. 9. Unused Jack (J2, port 2) G-type female connector. Not used in current applications VDC Test Point Used to measure power supply DC voltage. 11. Tilt Generators Input and interstage tilt generators provide combined tilt across the entire forward band spectrum. Amp TRFM Series RF Amplifier Module 47
12 TIARRA Optical Node Doc , Rev. C Plug-In Circuits 9-A-WC Return Input Attenuators (for ports 3, 4, 5, 6) 7-TG862-WC Tilt Generator Xp CORE EMS Transponder Module (incl. connector for EMS cable) 9-A-WC Forward Output Attenuators (for ports 3, 4, 5, 6) Figure 28. TRFM Amplifier, Plug-In Circuits Plug-in circuits allow you to customize the amplifier module. Shown here are the plug-ins accessible through openings in the TRFM amplifier cover. Other plug-ins are installed under the amplifier cover. CBR-NA-90 Crowbar Surge Arrestor A solid-state crowbar-protection circuit (CBR-NA-90) is available to replace a gas-discharge tube surge arrestor for 60- and 90-VAC-powered amplifiers. Remove the gas-discharge-tube surge arrestor before installing a crowbar circuit. See Installing the CBR-NA-90 Surge Arrestor, starting on page 171. Figure 29. CBR-NA-90 Crowbar Surge Arrestor The CBR-NA-90 crowbar circuit is available as an alternative to the gas-discharge-tube surge arrestor. 48 TRFM Series RF Amplifier Module
13 Doc , Rev. C TIARRA Optical Node Plug-ins for a TRFM Amplifier Plug-in Series Factory-Installed (under cover) a Forward attenuators, 4 Combiner/splitters, 2 Plug-in diplex filters & related circuits Required Forward output attenuators, 4 (see Figure 28) b Return input attenuators, 4 (see Figure 28) b,c Input tilt generator, 1 (see Figure 28) b Interstage tilt generator Return interface combiner board, 1 d Optional EMS transponder module, 1 (see Figure 28) e 9-A / jumper 6B-SC TIAN-DF KIT 9-A-WC 9-A-WC 7-TG862-WC 7-TG862-WC 6TIAN-RIC Xp CORE Amp RF detector, under cover Port return switch, under cover 6-RFD-85 6-PRS-PCB Current sensor, under cover CURRENT SENSOR For customers potentially interested in EMS capability, Philips strongly recommends ordering the EMS option as part of the original configuration. Transport-Launch plug-ins Return Equalizer, 1 Return Attenuator, 1 7-REF-WC 9-A-WC a. Not shown in Figure 28. See TRFM functional block diagram, Figure 26 on page 43. b. WC ( with cover ) series plug-ins have plastic covers that protect components and ease installation through openings in the amplifier cover. c. Attenuator is replaced with a 9-A-TERM 75-ohm plug-in terminator in any leg not being used for return signal. See page 159, step 2. d. Not shown in Figure 28. See Figure 27 for connector openings. e. The transponder module is also part of 6-EMS-RFD/PRS/CS-4 Port Kit, which includes a 6-RFD-85 RF detector, a 6-PRS-PCB port return switch, and a current sensor. TRFM Series RF Amplifier Module 49
14 TIARRA Optical Node Doc , Rev. C Specifications TRFM Series RF Amplifier Module 6-TRFM4C81/27-42/54 Units Forward Spectrum Bandwidth 54 to 870 MHz Response Flatness (peak-to-valley, typical) a ± 0.50 db Forward Operating Gain 27 db Return Loss all ports (75-Ohm) 16 db Test Points 20 ± 0.5 db Return Spectrum Bandwidth 5 to 42 MHz Response Flatness (peak-to-valley, typical) a ±0.50 db Return Operating Loss 12.5 db Return Loss all ports (75-ohm) 16 db Test Points 20 ± 0.5 db Forward Spectrum Distortion at Referenced Output (per NCTA test methods; NTSC System M) RF Input Level b 21 dbmv Referenced Output Level (12.5 db tilt, 50 MHz/ 870 MHz) 35.5/48 dbmv Number of Analog Channels (NTSC) c 77 Composite Triple Beat (typical) -75 dbc Cross Modulation (typical) -72 dbc Composite Second Order (typical, Vc & 1.25 MHz only) -70 dbc Noise Figure 8.0 db Hum 12 Amps maximum Amps maximum -65 dbc AC Bypass Current continuous: 15 2 hours: 25 Amps Amps Power Consumption (worst case) 52 W Ambient Operating Temperature Range (station) -40 to +60 (-40 to 140) C ( F) Dimensions (length x width x height) 46.5 x 21.5 x 11.4 (18.3 x 8.5 x 4.5) cm (in.) Weight 3 (6.5) kg (lb.) Specifications are subject to change without notice. a. Frequency response stated at peak-to-valley for entire frequency range along normalized slope. b. Using a DT-815-TX transmitter over a 15 db link (20 km fiber) with 77 NTSC channels from 50 to 550 MHz and -3 dbm input to the TSOR-U receiver. c. Specifications listed are typical. All calculations based on 77 analog NTSC channels from 50 to 550 MHz. 50 TRFM Series RF Amplifier Module
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